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Goodwill and Intangible Assets - Summary of Goodwill and Intangible Assets (Details) - USD ($) | 12 Months Ended |  |  |  |
--- | --- | --- | --- | --- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Apr. 30, 2016 | Jun. 30, 2009 | Jan. 31, 2005
Indefinite lived: |  |  |  |  |
Goodwill, Gross | $ 10,513,371 | $ 10,513,371 |  |  |
Goodwill | 10,513,371 | 10,513,371 |  |  |
Definite lived: |  |  |  |  |
Intangible assets, Gross | 24,717,873 | 24,717,873 |  |  |
Intangible assets, Accumulated Amortization | (18,708,144) | (17,089,479) |  |  |
Intangible assets, net book value | 6,009,729 | 7,628,394 |  |  |
Total goodwill and intangible assets, Gross | 35,231,244 | 35,231,244 |  |  |
Total goodwill and intangible assets, Net Book Value | $ 16,523,100 | 18,141,765 |  |  |
Inovio AS |  |  |  |  |
Indefinite lived: |  |  |  |  |
Goodwill |  |  |  |  | $ 3,900,000
VGX |  |  |  |  |
Indefinite lived: |  |  |  |  |
Goodwill |  |  |  | $ 6,200,000 |
Bioject |  |  |  |  |
Indefinite lived: |  |  |  |  |
Goodwill |  |  | $ 400,000 |  |
Minimum |  |  |  |  |
Schedule of intangible assets by major asset class |  |  |  |  |
Intangible asset, useful life | 2 years |  |  |  |
Maximum |  |  |  |  |
Schedule of intangible assets by major asset class |  |  |  |  |
Intangible asset, useful life | 18 years |  |  |  |
Patents |  |  |  |  |
Definite lived: |  |  |  |  |
Intangible assets, Gross | $ 5,802,528 | 5,802,528 |  |  |
Intangible assets, Accumulated Amortization | (5,681,673) | (5,618,854) |  |  |
Intangible assets, net book value | $ 120,855 | 183,674 |  |  |
Patents | Minimum |  |  |  |  |
Schedule of intangible assets by major asset class |  |  |  |  |
Intangible asset, useful life | 8 years |  |  |  |
Patents | Maximum |  |  |  |  |
Schedule of intangible assets by major asset class |  |  |  |  |
Intangible asset, useful life | 17 years |  |  |  |
Licenses |  |  |  |  |
Definite lived: |  |  |  |  |
Intangible assets, Gross | $ 1,323,761 | 1,323,761 |  |  |
Intangible assets, Accumulated Amortization | (1,190,609) | (1,161,861) |  |  |
Intangible assets, net book value | $ 133,152 | 161,900 |  |  |
Licenses | Minimum |  |  |  |  |
Schedule of intangible assets by major asset class |  |  |  |  |
Intangible asset, useful life | 8 years |  |  |  |
Licenses | Maximum |  |  |  |  |
Schedule of intangible assets by major asset class |  |  |  |  |
Intangible asset, useful life | 17 years |  |  |  |
CELLECTRA |  |  |  |  |
Definite lived: |  |  |  |  |
Intangible assets, Gross | $ 8,106,270 | 8,106,270 |  |  |
Intangible assets, Accumulated Amortization | (7,252,108) | (6,825,028) |  |  |
Intangible assets, net book value | $ 854,162 | 1,281,242 |  |  |
CELLECTRA | Minimum |  |  |  |  |
Schedule of intangible assets by major asset class |  |  |  |  |
Intangible asset, useful life | 5 years |  |  |  |
CELLECTRA | Maximum |  |  |  |  |
Schedule of intangible assets by major asset class |  |  |  |  |
Intangible asset, useful life | 11 years |  |  |  |
GHRH |  |  |  |  |
Schedule of intangible assets by major asset class |  |  |  |  |
Intangible asset, useful life | 11 years |  |  |  |
Definite lived: |  |  |  |  |
Intangible assets, Gross | $ 335,314 | 335,314 |  |  |
Intangible assets, Accumulated Amortization | (271,948) | (240,264) |  |  |
Intangible assets, net book value | 63,366 | 95,050 |  |  |
Bioject |  |  |  |  |
Definite lived: |  |  |  |  |
Intangible assets, Gross | 5,100,000 | 5,100,000 |  |  |
Intangible assets, Accumulated Amortization | (1,405,556) | (562,222) |  |  |
Intangible assets, net book value | $ 3,694,444 | 4,537,778 |  |  |
Bioject | Minimum |  |  |  |  |
Schedule of intangible assets by major asset class |  |  |  |  |
Intangible asset, useful life | 2 years |  |  |  |
Bioject | Maximum |  |  |  |  |
Schedule of intangible assets by major asset class |  |  |  |  |
Intangible asset, useful life | 15 years |  |  |  |
Other |  |  |  |  |
Schedule of intangible assets by major asset class |  |  |  |  |
Intangible asset, useful life | 18 years |  |  |  |
Definite lived: |  |  |  |  |
Intangible assets, Gross | $ 4,050,000 | 4,050,000 |  |  |
Intangible assets, Accumulated Amortization | (2,906,250) | (2,681,250) |  |  |
Intangible assets, net book value | $ 1,143,750 | $ 1,368,750 |  |  |

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